A major London music venue has been evacuated after an anonymous "bomb" threat.
Footage shared on social media shows huge crowds gathered outside the Hammersmith Apollo this evening.
Iranian pop star Dariush Eghbali, who has been living in exile since Iran's Islamic Revolution, was performing at the venue this evening.
Crowds who have gathered outside the building are now chanting "death to Khamenei", referring to Iran's religious supreme leader Sayyid Ali Hosseini Khamenei.
It comes as protests rage across Iran following the death of 22-year-old Mahsa Amini after she was arrested for wearing an "improper" hijab.
The Met Police said they received an anonymous call making a threat towards the Eventim Apollo at shortly after 8pm this evening.
Managers at the nightspot decided to evacuate the 3,000 concert-goers watching Dariush after officers informed them of the security risk.
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A spokesperson for the Met Police told MyLondon: "At 8.06pm on Sunday, October 9, police received an anonymous call making a threat towards a music venue which officers subsequently determined was likely to be the Eventim Apollo in Queen Caroline Street, W6.
"There was nothing to indicate that the threat made was genuine but at 8.21pm officers attended the venue to speak to security staff and to determine whether they were aware of anything suspicious or otherwise of concern.
"Nothing of suspicion had been brought to the attention of staff but at around 8.40pm, the venue management took the decision to evacuate as a precaution."
Dariush, who was performing at the venue, shot to fame with his ballad "Don't Tell Me You Love Me", although in recent years he has recorded protest songs against Iran's political system.
Pop music was banned in Iran following the 1979 revolution.
According to the journalist Fardad Farahzad, who writes for Iran International, police received a "credible threat of a potential bomb" at the Apollo.
He tweeted: "People have been asked to evacuate by police at the concert of the Iranian singer, Dariush in London due to serious security threats. I've been told by his manager that the police said there was a credible threat of a potential bomb at the venue."
Music fans said the evacuation sparked "absolute chaos", The Sun reports.
Crowds gathered outside the Hammersmith Apollo have started chanting "woman, life, liberty" following the evacuation.
Protests are raging across Iran following the death of Mahsa.
The 22-year-old died after she arrested by Iran's morality police for wearing an "improper" hijab.
Mahsa had travelled from Kurdistan to the country's capital to visit relatives when she was abducted from the street and beaten at a police station where a number of other women were also held.
More than 150 people have been killed, hundreds injured and thousands arrested by security forces since Mahsa's death in custody.
